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Homework Statement
Show that it is always possible to adjust measurement units such that a; b can be assigned any values
you want. This means that e.g. all van der Waals gases look exactly the same if the units are
accordingly adjusted. (This is what is called principle of corresponding states).
Homework Equations
##P=\frac{T}{v-b}-\frac{a}{v^2}##
The Attempt at a Solution
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So the question before this one was to work out the critical values for P, v and T for the van der waals equation of state + 3 other qualitatively similar gas models, the critical values were all of the form ##P_c \propto \frac{a}{b^2}##, ##T_c \propto \frac{a}{b}## and ##v_c \propto b## but I am not sure if this is relevant.
The question is confusing me to be honest, shouldn't it be trivially true that you can change your definition of a metre or kilogram in different cases to get the same values for different gasses?
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